SHO V6 swap into Triumph Stag

[zak]

I would recommend a 3.0 ECU, it will work better with a manual transmission. The injectors in the 3.2 are just a tad larger and will compensate for the increased displacement. To my understanding there are only 7 wires that need to interconnect the existing car harness with the SHO ECU/engine harness.

Couple of other notes - the front (new left) exhaust manifold from the 3.2 SHO automatic engine tucks in closer the the block, might be important to help fit. If I remember right the rear (right) exhaust manifold from a 3.0 SHO tucks in tigter to the block.

Folks have made spacers, around a half inch thick, between the intake manifold and the heads, that allow the intake to rotate 180 degrees putting the throttlebody at the front.

One issue to research is the thermostat housing which ends up right next to the firewall. Don't recall a real clean solution for that issue.

Finally, the engine may interfere with your master cylinder especially the power brake booster (does your car have power brakes?) Consider the Ford Hydroboost system which using a fluid pump on the engine to replace the vacuum brake booster. It was used on some Lincoln models.

 

[Old Man]

Zak,
Thank you !!!
That is all good information. You answered my question and some questions I was going to ask. The Stag does have a brake booster and you are right, it might be in the way. Thanks for the Hydroboost suggestion. I will look into that. I will also have to see where the Thermostat Housing ends up.

 

[Old Man]

How much horsepower can you get out of a NA engine and how much can you get with a turbo or supercharger?

 

[luigisho]

How much hp is of course 'it depends'. There are custom pistons, regular bolt ons, how much loss through transmission etc. Stock manual car is about 185-190ish to the wheels. add a few ponies for bolt ons but nothing massive. 3.2 to a manual car should give you a few more. The extra displacement was to offset a little extra drivelline loss in the auto cars.

You checked the fitment already? That has killed many a transplant project. It is high and wide especially with the intake design.

I think people were using a smallish dry 75shot of nitrous to bump up some power without having to tune for it. Need a double check confimation on that. THere are a few sc/turbo cars out there but I am not aware of anyone carrying a kit to make it easier. Might need some custom fab to get fitment right. there is a piggyback tweecer tuning device to manage that kind of change(forced induction) plugged into the port of the stock ecu. If it fits and you have the skill/$ to execute I am stoked to see it come together.

 

[Old Man]

Thanks Luigisho,
I have measured everything as best I can, and I have compared the dimensions that Off Road SHO posted to the dimensions of the engine that is in it now. The width and height will be tight, but I think it will fit. I bought a 3.2 engine and it is being shipped. I am very anxious to drop it in to test and see if it actually fits. My biggest concern, at this point, is will the exhaust manifolds fit. I'll just have to wait and see.
For now, I plan on keeping it NA. I don't think the rest of the driveline will take much more in it's current state. (No nitrous.....yet)
It will have a cold air intake that I am fabricating.
I have everything to learn about this engine. I would like to squeeze a few more horses out of it if I can.
Are the heads already as good as they are going to get or can they be ported and polished?
Any help is always appreciated.

 

[rubydist]

The heads are pretty good from the factory, but extrude honing the intake manifold will find a few horsepower.

 

[Old Man]

I would like to try extrude honing. I'm not sure I can afford it. Unfortunately this project has budget. No one does it where I live. Bend, OR

 

[zoomlater]

Ported intakes are an option extrude hone

https://shosource.com/products/ols/products/sho-source-v6-sho-ported-intake-manifold-89-95

There are also Big Bore Butterflys

https://shosource.com/products/ols/products/sho-source-big-bore-butterfly-kit-89-95

you can try a to post in the Want to buy section to see if anyone has some used parts they are looking to sell. You can look around the Shosource site to see what other things are available. They are located near Vancouver, WA.

 

[luigisho]

I would like to try extrude honing. I'm not sure I can afford it. Unfortunately this project has budget. No one does it where I live. Bend, OR

There are several places in the west you would have to send it to like CA, AZ and CO. Won't be cheap. Budget will certainly impact modifications. For bolt ons you can get the stock setup running and then add small stuff whenever. Bang for the buck on a budget is difficult. Check with Irish Pride on availability of 3.2 head gaskets. Part availability can also be a limiting factor on many things.

 

[zak]

If I recall correctly the 3.0 rear right) exhaust manifold hugs the block more closely. The 3.2 accessories will provide a reduced overall length (single belt system). Extrude honing the intake is worth 10 hp, the big bore butterflies another 10 hp. A reasonably free flowing exhaust another 8 hp. Beyond that there are cams, I am taking the route of putting 3.0 intake cams in the exhaust position.

 

[Old Man]

Thanks all,
I am interested in the big bore butterflies and will look into that. I will port the intake and I am planning on tying into the existing exhaust system, which should be good. i will use the 3.2 accessories if possible, even though I have plenty of room length wise. Zak you mentioned the different exhaust manifolds earlier and that is great info. Different cam maybe in the future. This will certainly be an ongoing project. Thanks again

 

[Old Man]

My new / used 1994 3.2 engine has arrived. It is sitting on a pallet in the back of my truck. The lift eye by the oil dip stick is very convenient and obvious, but I don't see the other lifting eye. There is some plastic wrap on the engine for protection, but I cut away the plastic where I thought the lift point would be located. Can someone tell me where the other lift point is.
As always thanks the info.

 

[luigisho]

There is no other lifting eye that I remember. Do you have things available for the chains other than a hook like L brackets or flat brackets?

Like these? You can get a flatish piece on the lower bolts of the intake support brackets. Remove the brackets you want to use and reuse the bolt at the lower bracket holes

 

[Old Man]

Yes, I have some options available or I can make something to bolt to a lower bolt hole of the intake support bracket if that is the way it is done.
Again, thank you !!

 

[luigisho]

Yes, I have some options available or I can make something to bolt to a lower bolt hole of the intake support bracket if that is the way it is done.
Again, thank you !!

Yep. the lower hole is on the head. The intake itself is not stable as the rubber couplers are between physical gaps in the intake